Diatremes


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Diatremes

 

(volcanic pipes), volcanic vents in the shape of vertical pipes widening toward the top to form a funnel. Diatremes result from major gas eruptions. They are common in the vicinity of Kimberley (South Africa), where they have been filled with a volcanic breccia-like rock (kimberlite) containing diamonds. In the last decade diamond-bearing kimberlite volcanic pipes have been discovered in the Yakut ASSR.

References in periodicals archive ?
Diatremy Belarusi (petrologicheskaya spetsializatsiya, almazonosnost') [Belorussian diatremes (petrological specialization, diamond potential)].
The likely presence of meta-dolerite xenoliths in Sydney region diatremes is also extremely low, as is the possibility of such material being in the older known palaeochannel remnants such as at Newington and Newtown.
Because these types of bodies are so different from ordinary volcanic pipes they have been given a different name: diatremes.
Anglo Swiss President, Len Danard stated, "We believe we have located a second diatreme approximately 4 kilometres from the McAllister Diatreme, which suggests that a cluster of diatremes may be present in the area.
Four parallel and related structures, which are interpreted as diatremes from a high sulfidation gold system, have been mapped on the concessions.
The authors are both qualified persons by NI43-101 definition, and are familiar with exploration for and experienced in discovery of diamond bearing kimberlite diatremes in the Northwest Territory.
The authors are both qualified persons by NI43-101 definition, and are familiar with exploration and experienced in discovery of diamond bearing kimberlite diatremes in the Northwest Territory.
Such fractures are often the preferred location of diatremes that rise from the deeper parts of the mantle, including the kimberlites that come from depths of around 200 kms where diamonds are a naturally stable form of carbon.
As Jilbey is targeting diatreme bodies in their exploration, and since there is a known association of high grade gold mineralization with some diatremes on Gold Canyon's properties, the Company is optimistic that other diatreme-related gold mineralization may be found as a result of Jilbey's exploration efforts.
This model is conceptually focussed on active subduction in which diamondiferous material is captured by rapidly rising alkalic magmas that cut through the subducted slab to form diatremes at surface.
Three large positive magnetic anomalies of 40-50 acres each were interpreted as diatremes.
A number of lake hosted horizontal conductors indicative of possible kimberlitic diatremes (diamonds) were prioritized for drilling which, hopefully, can commence while lake-ice is still thick enough to support vertical drilling operations.